Growing up outside of the US, I feel kinda cringed when he said he was "INSANELY proud of our collective teams achieved". Such an interesting cultural difference.
Everything is awesome, amazing, radical, insane, great, gnarly, not to mention sick, ill, righteous, dope. Californians just love superlatives, use them constantly, wear them out, and need new ones.
This spreads like a fine coating of mold over the rest of the country before going on to annoy the Commonwealth, and then we repeat. It's pretty cool.
So you have a politeness continuum from very, to hecka, to hella, to fuckin'. Which is dank.
And when every superlative has been watered down like this, you need to pick a word that's completely over the top to express anything with any strength of feeling. It's good, it's great, it's awesome! It's fantastic! It's incredible!! It's insanely unbelievably wonderful!!!
"Insanely" is just the latest entry in our internal linguistic arms race.
In the past few years there's been a similar but opposite degradation: the only adverbs anyone uses are "super", "super not", and "not super". I think it came from the infantilized condescending culture on Twitter.
Strictly restricted? Of course not. But for what it's worth I've been told by numerous Europeans that they perceive casually throwing around extreme hyperbole to be characteristically American behavior. I guess it goes with waitresses pretending to love you.
One definition for "insanely" is [0]:
> to an extreme degree.